the billionaire tech executive formerly served as chief of staff to larry summers during the clinton presidency. could easily finance her own campaign which would run $30 million to $40le. . stories i argue thinly reported there. but we will see. >> whether she has political ambitions, obviouslyquestion. one wonder why up against bongsbong bongsbongs boxer when feinstein's up in 18 and will be 85 and expected not run. a nasty primary campaign in a democratic state. >> facebook may be losing one of its rainmakers in term of modernization. >> i think it's part of the narrative, she's 44, ambitious, she has been as we pointed out involved in politics in a way, serving with larry summers years ago. >> $1.6 billion. >> made the billionaire's list for the first time on "forbes." following berkshire's shareholder letter, warren buffett sat down with becky quick who joins us with more from omaha. tour deforce, you guys covered everything from bitcoin, coke, ibm, activism. where to begin? >> you know, i thought we'd start out talking about what's happening today, carl. watch the major average